Biology:Dolichyl-P-Man:Man8GlcNAc2-PP-dolichol alpha-1,2-mannosyltransferase
| Dolichyl-P-Man:Man8GlcNAc2-PP-dolichol alpha-1,2-mannosyltransferase | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Identifiers | |||||||||
| EC number | 2.4.1.261 | ||||||||
| Databases | |||||||||
| IntEnz | IntEnz view | ||||||||
| BRENDA | BRENDA entry | ||||||||
| ExPASy | NiceZyme view | ||||||||
| KEGG | KEGG entry | ||||||||
| MetaCyc | metabolic pathway | ||||||||
| PRIAM | profile | ||||||||
| PDB structures | RCSB PDB PDBe PDBsum | ||||||||
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Dolichyl-P-Man:Man8GlcNAc2-PP-dolichol alpha-1,2-mannosyltransferase (EC 2.4.1.261, ALG9, ALG9 alpha1,2 mannosyltransferase, dolichylphosphomannose-dependent ALG9 mannosyltransferase, ALG9 mannosyltransferase, Dol-P-Man:Man8GlcNAc2-PP-Dol alpha-1,2-mannosyltransferase) is an enzyme with systematic name dolichyl beta-D-mannosyl phosphate:D-Man-alpha-(1->2)-D-Man-alpha-(1->2)-D-Man-alpha-(1->3)-(D-Man-alpha-(1->2)-D-Man-alpha-(1->3)-(D-Man-alpha-(1->6))-D-Man-alpha-(1->6))-D-Man-beta-(1->4)-D-GlcNAc-beta-(1->4)-D-GlcNAc-diphosphodolichol 2-alpha-D-mannosyltransferase.[1][2] This enzyme catalyses the following chemical reaction
- dolichyl beta-D-mannosyl phosphate + D-Man-alpha-(1->2)-D-Man-alpha-(1->2)-D-Man-alpha-(1->3)-[D-Man-alpha-(1->2)-D-Man-alpha-(1->3)-[D-Man-alpha-(1->6)]-D-Man-alpha-(1->6)]-D-Man-beta-(1->4)-D-GlcNAc-beta-(1->4)-D-GlcNAc-diphosphodolichol [math]\displaystyle{ \rightleftharpoons }[/math] D-Man-alpha-(1->2)-D-Man-alpha-(1->2)-D-Man-alpha-(1->3)-[D-Man-alpha-(1->2)-D-Man-alpha-(1->3)-[D-Man-alpha-(1->2)-D-Man-alpha-(1->6)]-D-Man-alpha-(1->6)]-D-Man-beta-(1->4)-D-GlcNAc-beta-(1->4)-D-GlcNAc-diphosphodolichol + dolichyl phosphate
The formation of N-glycosidic linkages of glycoproteins involves the ordered assembly of the common Glc3Man9GlcNAc2 core-oligosaccharide on the lipid carrier dolichyl diphosphate.
References
- ↑ "Quality control of glycoproteins bearing truncated glycans in an ALG9-defective (CDG-IL) patient". Glycobiology 19 (8): 910–7. August 2009. doi:10.1093/glycob/cwp067. PMID 19451548.
- ↑ "ALG9 mannosyltransferase is involved in two different steps of lipid-linked oligosaccharide biosynthesis". Glycobiology 15 (11): 1156–63. November 2005. doi:10.1093/glycob/cwj002. PMID 15987956.
External links
- Dolichyl-P-Man:Man8GlcNAc2-PP-dolichol+alpha-1,2-mannosyltransferase at the US National Library of Medicine Medical Subject Headings (MeSH)
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